package com.sky.service.impl;

import com.github.pagehelper.Page;
import com.github.pagehelper.PageHelper;
import com.sky.constant.MessageConstant;
import com.sky.constant.StatusConstant;
import com.sky.dto.SetmealDTO;
import com.sky.dto.SetmealPageQueryDTO;
import com.sky.entity.Dish;
import com.sky.entity.Setmeal;
import com.sky.entity.SetmealDish;
import com.sky.exception.DeletionNotAllowedException;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetmealMapper;
import com.sky.mapper.SetmaelDishMapper;
import com.sky.result.PageResult;
import com.sky.service.SetmealService;
import com.sky.vo.DishItemVO;
import com.sky.vo.SetmealVO;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.util.List;

@Service
@Slf4j
public class SetmealServiceImpl implements SetmealService {

    @Autowired
    private SetmealMapper setmealMapper;
    @Autowired
    private SetmaelDishMapper setmaelDishMapper;
    @Autowired
    private DishMapper dishMapper;

    /**
     * 新增套餐，同时需要保存套餐和菜品之间的关系
     *
     * @param setmealDTO
     */
    @Transactional
    @Override
    public void saveWithDish(SetmealDTO setmealDTO) {
        Setmeal setmeal = new Setmeal();
        BeanUtils.copyProperties(setmealDTO, setmeal);

        //往套餐表中插入数据
        setmealMapper.insert(setmeal);

        //获取往套餐表插入数据后生成的主键id
        Long setmealId = setmeal.getId();

        //遍历套餐下的菜品，设置菜品所在的套餐id
        List<SetmealDish> setmealDishes = setmealDTO.getSetmealDishes();
        setmealDishes.forEach(setmealDish -> {
            setmealDish.setSetmealId(setmealId);
        });

        //保存套餐和菜品的关系
        setmaelDishMapper.insertBatch(setmealDishes);
    }

    /**
     * 套餐分页查询
     *
     * @param setmealPageQueryDTO
     * @return
     */
    @Override
    public PageResult pageQuery(SetmealPageQueryDTO setmealPageQueryDTO) {
        int pageNum = setmealPageQueryDTO.getPage();
        int pageSize = setmealPageQueryDTO.getPageSize();

        PageHelper.startPage(pageNum, pageSize);
        Page<SetmealVO> page = setmealMapper.pageQuery(setmealPageQueryDTO);

        return new PageResult(page.getTotal(), page.getResult());

    }

    @Override
    public void deleteBatch(List<Long> ids) {
        //遍历传入的id数组，判断各id对应套餐是否为启售中
        ids.forEach(id -> {
            Setmeal setmeal = setmealMapper.getById(id);
            if (setmeal.getStatus() == StatusConstant.ENABLE) {
                //启售中的套餐不能删除
                throw new DeletionNotAllowedException(MessageConstant.SETMEAL_ON_SALE);
            }
        });

        ids.forEach(setmealId -> {
            //删除套餐表中的数据
            setmealMapper.deleteById(setmealId);
            //删除套餐菜品关系表中的数据
            setmaelDishMapper.deleteBySetmealId(setmealId);
        });

    }

    @Override
    public SetmealVO getByIdWithDish(Long id) {
        Setmeal setmeal = setmealMapper.getById(id);
        List<SetmealDish> setmealDishes = setmaelDishMapper.getBySetmealId(id);

        SetmealVO setmealVO = new SetmealVO();
        BeanUtils.copyProperties(setmeal, setmealVO);
        setmealVO.setSetmealDishes(setmealDishes);

        return setmealVO;
    }

    @Override
    public void update(SetmealDTO setmealDTO) {
        Setmeal setmeal = new Setmeal();
        BeanUtils.copyProperties(setmealDTO, setmeal);

        //1.修改套餐表，执行update方法
        setmealMapper.update(setmeal);

        //获取套餐id
        Long id = setmealDTO.getId();

        //2.删除菜品和套餐的关联关系，操作setmeal_dish表，执行delete方法
        setmaelDishMapper.deleteBySetmealId(id);

        List<SetmealDish> setmealDishes = setmealDTO.getSetmealDishes();
        setmealDishes.forEach(setmealDish -> {
            setmealDish.setSetmealId(id);
        });
        //3.重新插入套餐和菜品之间的关联关系，操作setmeal_dish表，执行insertBatch方法
        setmaelDishMapper.insertBatch(setmealDishes);
    }

    /**
     * 套餐的启售停售
     *
     * @param status
     * @param id
     */
    @Transactional
    @Override
    public void startOrStop(Integer status, Long id) {
        //启售套餐的时候，要先判断套餐内有没有停售菜品，如果套餐中有停售菜品就提示"套餐内含有已经停售的菜品"
        if (status == StatusConstant.ENABLE) {
            //select a.* from dish a left join setmeal_dish b on a.id = b.dish_id where b.setmeal_id = ?
            List<Dish> dishList = dishMapper.getBySetmealId(id);
            if (dishList != null && dishList.size() > 0) {
                dishList.forEach(dish -> {
                    if (status == StatusConstant.DISABLE) {
                        throw new DeletionNotAllowedException(MessageConstant.SETMEAL_ENABLE_FAILED);
                    }
                });
            }
        }

        Setmeal setmeal = Setmeal.builder()
                .id(id)
                .status(status)
                .build();
        setmealMapper.update(setmeal);

    }

    /**
     * 动态条件查询套餐数据
     *
     * @param setmeal
     * @return
     */
    @Override
    public List<Setmeal> list(Setmeal setmeal) {
        List list = setmealMapper.list(setmeal);
        return list;
    }

    /**
     * 根据套餐id查询菜品选项
     *
     * @param id
     * @return
     */
    @Override
    public List<DishItemVO> getDishItemById(Long id) {
        return setmealMapper.getDishItemBysetmealId(id);
    }
}
